How to Use the RRB Signature Resizer
- Click Select Image or drag and drop your signature image onto the upload area.
- The tool automatically pre-fills the required dimensions (50×20 mm) and the 70KB limit.
- Use the crop tool to center your signature within the box.
- Click Process Image to apply the resizing and compression.
- Preview the final result and click Download to save the JPEG file.
RRB Signature Requirements 2025
| Requirement | Value |
|---|---|
| Dimensions | 50 mm × 20 mm |
| File Size | 30 KB to 70 KB |
| Format | JPEG / JPG |
| Ink Color | Black Ink (Mandatory) |
| Background | Plain White Paper |
| Handwriting | Running Handwriting (No Block Letters) |
Why These Exact Specifications Matter
For Railway Recruitment Board (RRB) exams like NTPC, ALP, and RPF, the signature is a critical identifier used for biometric verification during the exam and subsequent document verification stages. The RRB portal is programmed to accept only signatures that match the 50mm x 20mm aspect ratio and fall within the 30KB to 70KB file size range.
If you upload a signature in all capital letters or using blue ink, your application is likely to be rejected. Similarly, if the file size is outside the allowed range, the upload will fail. This RRB signature resizer tool ensures your signature meets all technical and stylistic requirements set by the board for the 2025 recruitment cycle.
Common Mistakes to Avoid
- Using Block Letters: Never sign in CAPITAL LETTERS. RRB strictly requires running handwriting.
- Wrong Ink Color: Only use black ink. Blue, red, or green ink signatures are frequently rejected by the RRB scanning system.
- Small File Size: If your signature image is too "light" (under 30KB), it may not be clear enough for the admit card. Aim for the 30-70KB sweet spot.
- Blurry or Smudged: Ensure you sign on a clean piece of white paper and take a clear, well-lit photo or scan.
- Signature on Lined Paper: Always use plain white unlined paper to ensure the background is clean.
RRB Signature Specifications — Full Details
As per the official CEN notifications, candidates must sign on white paper with a black ink pen within a box of 50mm x 20mm. The signature must be done by the candidate and not by anyone else. If the signature on the admit card at the time of the examination does not match the signature on the application, the candidate may be disqualified.
The signature will be printed on the admit card and the attendance sheet. Any discrepancy in the signature during any stage of the recruitment process can lead to the cancellation of candidature.
Frequently Asked Questions
Can I sign in blue ink for RRB NTPC? No. RRB notifications specifically mention black ink for signatures. Using blue ink is a common reason for application rejection.
What is the pixel size for RRB signature? While the physical spec is 50x20mm, the digital preferred resolution is approximately 140x60 pixels at 100 DPI. Our tool handles these conversions automatically.
Does this tool work for RRB ALP and Group D? Yes, the signature specifications are standardized across almost all RRB recruitment categories including ALP, Technician, NTPC, and Level-1 (Group D) posts.
Can I upload a PNG signature? The RRB portal requires JPEG/JPG format. Our tool automatically converts any uploaded image into the correct JPEG format for you.
Is there a charge to use this signature resizer? No, the RRB signature resizer is 100% free to use, works entirely in your browser, and does not add any watermarks.